Refactor code structure for improved readability and maintainability

vite.config.mjs

@@ -0,0 +1,12 @@
+import react from '@vitejs/plugin-react';
+import { defineConfig } from 'vite';
+import tsconfigPaths from 'vite-tsconfig-paths';
+
+export default defineConfig({
+  plugins: [react(), tsconfigPaths()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: './vitest.setup.mjs',
+  },
+});